My philosophy is it is better to be safe than sorry...
So, do you wear a bulletproof vest all the time? In the shower? Same difference.
Could you share which Anti Virus software do you use if at all? I just got new Mac and I'm considering if I should get one.
I used to respond to this frequently asked question with a long answer. But now I just recommend watching these excellent free videos:
Do Macs Need Anti-Virus Software?
http://macmost.com/do-macs-need-antivirus.html
How To Protect Your Mac From Malware
http://macmost.com/how-to-protect-your-mac-from-malware.html
These videos are 6-7 years old so they prove nothing...